Theresa May, a long-serving cabinet minister, succeeds David Cameron as prime minister today. Mr. Cameron will be in Parliament before heading to Buckingham Palace to ask Queen Elizabeth II to accept Ms. May as his successor.

Funerals for the five police officers killed in Dallas begin today. At a memorial service on Tuesday, President Obama urged the nation to overcome its racial divides.

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Funerals begin today for the five police officers slain in Dallas last Thursday.Credit
Stephen Crowley/The New York Times

He’ll address the same theme today at the White House, as he seeks “constructive actions that are actually going to make a difference” from activists, police officials, civil rights leaders and local political leaders. One open question is whether bias-reduction programs can lead to lasting change in policing.

That’s what the mother of Philando Castile, who was fatally shot by a police officer last week in Minnesota, said as she called for a special prosecutor to take over the case. Mr. Castile’s funeral will be held on Thursday.

Some supporters of Bernie Sanders suggest that they will give Hillary Clinton a chance in order to stop Donald J. Trump, but others say they will give a third party a chance.Credit
Doug Mills/The New York Times

A retired admiral, James G. Stavridis, is being vetted as a possible running mate for Mrs. Clinton. And the attorney general, Loretta E. Lynch, told a House committee that she was “extremely proud” of the criminal inquiry into Mrs. Clinton’s email system, but she didn’t discuss its details.

Noteworthy

• Midseason report card.

Major League Baseball is on pace to have more than 5,600 home runs this season, a level exceeded only once: in 2000, at the height of the steroid era. Have a look at the top overachieving and underachieving teams.

Two Kansas City Royals homered to lead the American League to a 4-2 victory over the National League in the All-Star Game. The win ensures home-field advantage for the A.L. in the World Series for the fourth-straight year.

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NASA has released the first photograph of Jupiter taken from the Juno spacecraft.Credit
NASA/Southwest Research Institute, via Malin Space Science Systems

• What to watch.

“The A Word,” a six-part series, is about a family slowly coming to the realization that its youngest member has autism (10 p.m., SundanceTV). “9 Months That Made You,” which covers human development from conception to birth, continues at 10 p.m. on most PBS stations.

In response to rumors that she is pregnant, the actress Jennifer Aniston writes in The Huffington Post: “I’m fed up with the sport-like scrutiny and body shaming that occurs daily under the guise of ‘journalism,’ the ‘First Amendment’ and ‘celebrity news.’ ”

One of the biggest and most famous in history was dedicated on this day in 1923 in the Hollywood Hills.

The 50-foot-tall letters, “H-O-L-L-Y-W-O-O-D-L-A-N-D,” were installed to promote sales in a housing development called — surprise! — Hollywoodland.

Large white-painted panels formed each letter, which were mounted to a framework of pipes, wires and telephone poles. For pizazz, light bulbs were added.

Meant to be a short-lived advertisement, the letters quickly became a symbol of the glamour and glitz of American show business. But by the mid-1940s, the sign began to crumble.

The developers soon pulled out of the neighborhood. The sign came to be part of a public park and control of it fell to the city of Los Angeles. The last four letters were removed in 1949, after the Hollywood Chamber of Commerce paid for the sign’s refurbishment.

After losing one of the “O’s” to termites, the sign was torn down in 1978 and rebuilt. The 450-foot-long landmark remains a beacon — though not for homes in the area. Those tend to sell themselves.